Screen door



FIG. 1 is a front elevational view of a screen door illustrating my new design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a left edge view thereof;

FIG. 4 is a right edge view thereof;

FIG. 5 is a top edge view thereof; and

FIG. 6 is a bottom edge view thereof. 

The ornamental design for a screen door, as described and shown. 